feat(gallery): linked reference photos in spec sheets; steady the slide toggle

Reference photos now live in docs/prototypes/reference/ named after their widget, and a spec sheet links its photo via a ref field — one line per future card. The slide toggle also stops jumping on click (the order flip changed which flex item supplied the inline baseline; vertical-align middle pins it) and the thumb keeps one color — the revealed track signals the state, like the hardware.

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